IN BELOW ZERO TEMPS MY CAR IS VERY SLUGGISH, ABOVE ZERO IT RUNS LIKE A TOP

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AFTER WARMING UP THE BLAZER FOR 15 MINUTES OR SO IN BELOW ZERO TEMPS, THE RPMS REV UP BUT CAR JUST CRAWLS DOWN THE ROADWAY. I'VE HAD THE BLAZER 7 YEARS, NEVER HAD THIS PROBLEM BEFORE. FYI - TRANY FLUID IS CLEAN